Re: Can't boot IDE, can access drive if Boot A:\

Re: Can't boot IDE, can access drive if Boot A:\
Re: Can't boot IDE, can access drive if Boot A:\

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Posted by Henry on April 09, 2002 at 22:36:47:
In Reply to: Re: Can't boot IDE, can access drive if Boot A:\ posted by colin on April 07, 2002 at 18:04:54:
: Henry might disagree but the main reason that the MBR switch in Fdisk is un-documented is that it has a tendancy to re-write a comply screwed Boot record and partition table, it very rarely succeeds, most of the main 'tech' advice sites say don't use it ever and I tend to agree.
: Unfortunately once done you cant undo it you should seriously consider an OS re-install, even if just over the top, to write a readable record.

Looks like we lost the poster.
I agree that fdisk /mbr is rarely the solution of first choice, but it should be used in EVERY case of simple HDD reformatting because the mbr needs to be rebuilt clean, too (for whatever reason, if an mbr exixts it IS NOT overwritten unless you force it with fdisk /mbr).
fdisk /mbr overwrites the mbr on drive zero (c:) - that is, the first sector on the HDD. Seems like there are at least two copies of the FAT, one in the mbr, the other elsewhere. When you run chkdsk or scandisk it will "notice" that the tables are different and SHOULD fix them.
Henry

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Re: Can't boot IDE, can access drive if Boot A:\ colin 02:01:26 4/10/02 (0)

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: : Henry might disagree but the main reason that the MBR switch in Fdisk is un-documented is that it has a tendancy to re-write a comply screwed Boot record and partition table, it very rarely succeeds, most of the main 'tech' advice sites say don't use it ever and I tend to agree. : : Unfortunately once done you cant undo it you should seriously consider an OS re-install, even if just over the top, to write a readable record. : : Looks like we lost the poster. : I agree that fdisk /mbr is rarely the solution of first choice, but it should be used in EVERY case of simple HDD reformatting because the mbr needs to be rebuilt clean, too (for whatever reason, if an mbr exixts it IS NOT overwritten unless you force it with fdisk /mbr). : fdisk /mbr overwrites the mbr on drive zero (c:) - that is, the first sector on the HDD. Seems like there are at least two copies of the FAT, one in the mbr, the other elsewhere. When you run chkdsk or scandisk it will "notice" that the tables are different and SHOULD fix them. : Henry
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